Improvement in sewing-machines



UNITED STATES PATENT OFFICE.

LINCOLN A. MERRIAM, OF NEW YORK, ASSIGNOR TO HIMSELF AND ELISHA P. WHEELER, OF MIDDLETOWN, NEW YORK.

IMPROVEMENT IN SEWING-MACHINES.

To all whom it may concern:

Be it known that I, LINCOLN A. MERRIAM, of the city, county, and State of New-York, have invented a new and Improved Sewing-Machine; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon.'

My invention consists in a shuttle sewingmachine, constructed as will be hereinafter described, and having appropriate mechanical devices for actuating its various parts.

To ena-ble others skilled in the art to make and use my invention, Iwill proceed to describe its construction and operation.

The needle-arm C is pivoted to the frame A by the pin S, and has an irregular reciprocating motion imparted to it by a crank, E', working in an angular slot, C', in the lower end of said arm. The arm at the forward end is provided with a ball-like termination, and enters the slot d in the needle-bar. The needle, having descended to its lowest point, is made to rise quickly to form a loop for the shuttle. It then rests to allow the shuttle to pass through the loop, and it then rises and delays, and while fully raised the work is fed forward for the next stitch. The arm H is pivoted at its lower end,

as shown, and connected at the top to a link,

I, which in turn is connected to the pivoted shuttle-carrier, K. This arm H is moved by the crank E", which works in the irregular slot h. In this manner motion is imparted to the shuttle-carrier K. The crank-pin E", in passing through that part of the slot h designated by l, carries the shuttle rapidly through the loop, and while it passes up division 2 of the slot h the shuttle remains stationary. This delay ofthe shuttle is in order that the stitch may be tightened by the needle as it rises to its highest position. The shuttle L, Fig. 8, is curved downward at the point so as to easily enter and clear theloop of the needle-thread, and has a slot near the point and heel for the fingers of the shuttle-carrier to bear against. The shuttlc-carrier K is secured to the frame A by the pin k, and the shuttle is caused to move in the arc of a circle, as shown in Fig. l. The upper end of the presser-bar F is hollow and provided with the spiral spring F"', the top of which rests against the pin f', resting inthe slot f. This spring presses the presser-foot downward upon the material to be sewed. In this foot I use one or more feed-rollers, F", to obviate the unequal feeding of the layers of the material. The feed-dog F' has its fulcrum on a point, G', that enters its socket f", and this point is made adjustable laterally by means of a thumb-screw, G", and held in position by the set-nut g' turned upon the screw g. The cam e, Fig. 4, strikes one end of the feed-dog and forces the other end upward against the feed-roller or rollers, which causes the material lying between them to be held firmly and somewhat raised from the bed at that point. Then the side cam e' strikes the feed-dog, and it carries forward the material, the top sliding freely under the roller or rollers. The cams then leave the dog, and the spring f'" returns to its place ready to carry the work forward for another stitch. The tension M, Fig. 1, is composed of the standard O having a slot, o, over which passes the cylinder N, which is secured in its place by the setnut P. The hole N passes through the standard O and the cylinder N, and, turning the cylinder on the standard, changes the direction of the thread passing through these holes, and gives any tension required. B B, Fig. 2, is a small table, that allows a sleeve or other small article to pass around it for sewing. This table may be removed and the broad table B' substituted for it. The machine is driven by a band over the pulley E"'.

What I claim as my invention, and wish to secure by Letters Patent, is

l. The pulley E', cranks E' and E", and

cams c e', when constructed, as described and shown, to operate the needle-shuttle and feed.

2. The arms C and H, slotted, as described and shown, and arranged to be operated by the cranks E' and and connected and combined with the needle-bar and pivoted shuttle-carrier K, as set forth. f'

3. The presser-bar F, having the internal spring F"' and one or more feed-rollers F", located as shown.

4. The combination of the above with the feed-dog F', mounted on the adjustable fulcrum-pin G', for the uses set forth.

LINCOLN A. MERRIAM.

Witnesses EDM. F. BROWN, W. G. HENDERSON. (154) 

